'use client'

import { useEffect, useState } from 'react'
import Link from 'next/link'
import { usePathname } from 'next/navigation'
import clsx from 'clsx'

import { Hero } from '@/components/Hero'
import { Logo, Logomark } from '@/components/Logo'
import { MobileNavigation } from '@/components/MobileNavigation'
import { Navigation } from '@/components/Navigation'
import { Search } from '@/components/Search'
import { ThemeSelector } from '@/components/ThemeSelector'

function GitHubIcon(props: React.ComponentPropsWithoutRef<'svg'>) {
  return (
    <svg aria-hidden="true" viewBox="0 0 16 16" {...props}>
      <path d="M8 0C3.58 0 0 3.58 0 8C0 11.54 2.29 14.53 5.47 15.59C5.87 15.66 6.02 15.42 6.02 15.21C6.02 15.02 6.01 14.39 6.01 13.72C4 14.09 3.48 13.23 3.32 12.78C3.23 12.55 2.84 11.84 2.5 11.65C2.22 11.5 1.82 11.13 2.49 11.12C3.12 11.11 3.57 11.7 3.72 11.94C4.44 13.15 5.59 12.81 6.05 12.6C6.12 12.08 6.33 11.73 6.56 11.53C4.78 11.33 2.92 10.64 2.92 7.58C2.92 6.71 3.23 5.99 3.74 5.43C3.66 5.23 3.38 4.41 3.82 3.31C3.82 3.31 4.49 3.1 6.02 4.13C6.66 3.95 7.34 3.86 8.02 3.86C8.7 3.86 9.38 3.95 10.02 4.13C11.55 3.09 12.22 3.31 12.22 3.31C12.66 4.41 12.38 5.23 12.3 5.43C12.81 5.99 13.12 6.7 13.12 7.58C13.12 10.65 11.25 11.33 9.47 11.53C9.76 11.78 10.01 12.26 10.01 13.01C10.01 14.08 10 14.94 10 15.21C10 15.42 10.15 15.67 10.55 15.59C13.71 14.53 16 11.53 16 8C16 3.58 12.42 0 8 0Z" />
    </svg>
  )
}

function Header() {
  let [isScrolled, setIsScrolled] = useState(false)

  useEffect(() => {
    function onScroll() {
      setIsScrolled(window.scrollY > 0)
    }
    onScroll()
    window.addEventListener('scroll', onScroll, { passive: true })
    return () => {
      window.removeEventListener('scroll', onScroll)
    }
  }, [])

  return (
    <header
      className={clsx(
        'sticky top-0 z-50 flex flex-none flex-wrap items-center justify-between bg-white px-4 py-5 shadow-md shadow-slate-900/5 transition duration-500 sm:px-6 lg:px-8 dark:shadow-none',
        isScrolled
          ? 'dark:bg-slate-900/95 dark:backdrop-blur-sm dark:[@supports(backdrop-filter:blur(0))]:bg-slate-900/75'
          : 'dark:bg-transparent',
      )}
    >
      <div className="mr-6 flex lg:hidden">
        <MobileNavigation />
      </div>
      <div className="relative flex grow basis-0 items-center">
        <Link href="/" aria-label="Home page">
          <Logomark className="h-9 w-9 lg:hidden" />
          <Logo className="hidden h-9 w-auto fill-slate-700 lg:block dark:fill-sky-100" />
        </Link>
      </div>
      <div className="-my-5 mr-6 sm:mr-8 md:mr-0">
        <Search />
      </div>
      <div className="relative flex basis-0 justify-end gap-6 sm:gap-8 md:grow">
        <ThemeSelector className="relative z-10" />
        <Link href="https://github.com/mikecousins/react-pdf-js" className="group" aria-label="GitHub">
          <GitHubIcon className="h-6 w-6 fill-slate-400 group-hover:fill-slate-500 dark:group-hover:fill-slate-300" />
        </Link>
      </div>
    </header>
  )
}

export function Layout({ children }: { children: React.ReactNode }) {
  let pathname = usePathname()
  let isHomePage = pathname === '/'

  return (
    <div className="flex w-full flex-col">
      <Header />

      {isHomePage && <Hero />}

      <div className="relative mx-auto flex w-full max-w-8xl flex-auto justify-center sm:px-2 lg:px-8 xl:px-12">
        <div className="hidden lg:relative lg:block lg:flex-none">
          <div className="absolute inset-y-0 right-0 w-[50vw] bg-slate-50 dark:hidden" />
          <div className="absolute top-16 right-0 bottom-0 hidden h-12 w-px bg-linear-to-t from-slate-800 dark:block" />
          <div className="absolute top-28 right-0 bottom-0 hidden w-px bg-slate-800 dark:block" />
          <div className="sticky top-[4.75rem] -ml-0.5 h-[calc(100vh-4.75rem)] w-64 overflow-x-hidden overflow-y-auto py-16 pr-8 pl-0.5 xl:w-72 xl:pr-16">
            <Navigation />
          </div>
        </div>
        {children}
      </div>
    </div>
  )
}
